JP4750669B2 - Communication terminal, communication method, and communication program - Google Patents

Description

  The present invention relates to a communication terminal, a communication method, a communication program, a communication control device, a communication control method, a communication control program, and a communication system. In particular, the present invention relates to a communication terminal, a communication method, a communication program, a communication control apparatus, a communication control method, a communication control program, and a communication system that perform voice data packet communication.

Patent Document 1 proposes a PoC system that records communication contents transmitted and received between each session of PoC (Push-to-talk over Cellular) according to a predetermined rule.
JP 2005-234666 A

  In the invention described in Patent Document 1, when communication by a half-duplex Push-To-Talk (PTT) communication method is performed between a plurality of communication terminals, it participates in communication by the PTT communication method. When there is no communication terminal, for example, when there is a communication terminal that exists outside the service area, the communication content indicating the content of communication by the PTT communication method can be recorded from the start of the session. However, when transmission / reception of communication content is performed in real time as in the PTT communication method, the communication content recorded from the start of the session is transmitted later to the communication terminal that has moved from outside the service area to the communication terminal. Even if the user is notified, it may be difficult for the user to grasp the communication content.

  Accordingly, an object of the present invention is to provide a communication terminal, a communication method, a communication program, a communication control device, a communication control method, a communication control program, and a communication system that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous specific examples of the present invention.

  In order to solve the above-described problem, in the first embodiment of the present invention, a communication terminal that performs packet communication of voice data, a voice input unit that inputs voice, and a voice that indicates voice input by the voice input unit From a voice packet generation unit that generates a packet, a data transmission unit that transmits a voice packet generated by the voice packet generation unit to a communication terminal of a communication partner, and an external communication relay device that relays communication with the communication terminal of the communication partner By monitoring the electric field strength of the data transmission unit, a communication availability determination unit that determines whether or not a voice packet can be transmitted from the data transmission unit to the communication terminal of the communication partner, and a communication availability determination unit transmit the voice packet from the data transmission unit. When it is determined that the data cannot be transmitted, the data recording unit records the audio data indicated by the audio packet to be transmitted by the data transmission unit, and the data recording unit records the audio data. In other words, by monitoring the electric field strength from the communication relay device, a transmission possible detection unit that detects that a voice packet can be transmitted from the data transmission unit and a transmission possible detection unit are A transmission control unit configured to transmit a voice packet indicating voice data recorded by the data recording unit from the data transmission unit to the communication terminal of the communication partner when it is detected that the packet can be transmitted.

  In addition, the transmission control unit is in a state in which the transmission possible detection unit can transmit the voice packet after the predetermined first time elapses after the communication availability determination unit determines that the voice packet cannot be transmitted. When this is detected, the voice packet indicated by the voice data recorded by the data recording unit may be transmitted from the data transmission unit to the communication terminal of the communication partner. In addition, when the communication availability determination unit determines that the voice packet cannot be transmitted and does not detect that the transmission detection unit is ready to transmit the voice packet before the first time elapses, A data erasing unit for erasing audio data recorded by the data recording unit may be further provided.

  According to a second aspect of the present invention, there is provided a communication method for performing packet communication of voice data, a voice input stage for inputting voice, and a voice for generating voice packets indicating voice input in the voice input stage. Data that transmits the voice packet generated in the voice packet generation stage to the communication terminal of the communication partner by monitoring the electric field strength from the external communication relay device that relays the communication with the communication terminal of the communication partner and the packet generation stage. The voice indicated by the voice packet to be transmitted by the data transmission unit when it is determined that the voice packet cannot be transmitted from the data transmission unit in the communication availability determination stage for determining whether transmission from the transmission unit is possible and the communication availability determination stage. When data is recorded at the data recording stage and when the audio data is recorded at the data recording stage, the electric field strength from the communication relay device Detecting that the voice transmitter can be transmitted from the data transmitter, and detecting that the voice transmitter can be transmitted from the data transmitter in the transmittable detection stage. In this case, there is provided a transmission control step of transmitting a voice packet indicating the voice data recorded in the data recording step from the data transmission unit to the communication terminal of the communication partner.

  Further, in the third embodiment of the present invention, a communication program for a communication terminal that performs packet communication of voice data, the voice input unit for inputting voice and the voice input by the voice input unit are shown. A voice packet generation unit that generates a voice packet, a data transmission unit that transmits a voice packet generated by the voice packet generation unit to a communication terminal of a communication partner, and an external communication relay device that relays communication with the communication terminal of a communication partner If the data transmission unit determines whether or not the voice packet can be transmitted from the data transmission unit to the communication terminal of the communication partner by monitoring the electric field strength, and the communication availability determination unit cannot transmit the voice packet from the data transmission unit. If it is determined, the data recording unit records the audio data indicated by the audio packet to be transmitted by the data transmission unit, and the data recording unit records the audio data. In other words, by monitoring the electric field strength from the communication relay device, a transmission possible detection unit that detects that a voice packet can be transmitted from the data transmission unit, When it is detected that the data recording unit is ready to transmit, the data recording unit functions as a transmission control unit that transmits the audio packet indicating the audio data recorded from the data transmission unit to the communication terminal of the communication partner.

  According to a fourth aspect of the present invention, there is provided a communication control apparatus for controlling packet communication of voice data between a first communication terminal and a second communication terminal that is a communication partner of the first communication terminal, A data reception unit that receives a voice packet transmitted by one communication terminal, a data transmission unit that transmits a voice packet received by the data reception unit to a second communication terminal, and an external communication that relays communication with the second communication terminal Based on the electric field strength from the relay device to the second communication terminal, a communication availability determination unit that determines whether or not a voice packet can be transmitted from the data transmission unit to the second communication terminal, and a communication availability determination unit include the second communication When it is determined that the voice packet cannot be transmitted from the data transmission unit to the terminal, the data recording unit records the voice data indicated by the voice packet to be transmitted by the data transmission unit, and the data recording unit records the voice data. In this case, based on the electric field strength from the communication relay device to the second communication terminal, a transmission capability detection unit that detects that a voice packet can be transmitted from the data transmission unit to the second communication terminal, and a transmission capability detection Control that causes the data transmission unit to transmit a voice packet indicating the voice data recorded by the data recording unit to the second communication terminal when the unit detects that the data transmission unit is ready to transmit a voice packet from the data transmission unit A part.

  According to a fifth aspect of the present invention, there is provided a communication control method for controlling packet communication of voice data between a first communication terminal and a second communication terminal that is a communication partner of the first communication terminal, Based on the data reception stage for receiving voice packets transmitted by one communication terminal, and the electric field strength from an external communication relay device that relays communication with the second communication terminal to the second communication terminal, to the second communication terminal, A data transmission unit that transmits the voice packet received in the data reception stage to the second communication terminal determines whether or not the voice packet can be transmitted. In the communication availability determination stage, data is transmitted to the second communication terminal in the communication availability determination stage. In the data recording stage for recording the voice data indicated by the voice packet to be transmitted by the data transmitting section when it is determined that the voice packet cannot be transmitted from the transmitting section; When voice data is recorded, based on the electric field strength from the communication relay device to the second communication terminal, it is detected that a voice packet can be transmitted from the data transmission unit to the second communication terminal. In the transmission enable detection stage, when it is detected that a voice packet can be transmitted from the data transmission unit, the voice packet indicating the voice data recorded in the data recording stage is transmitted from the data transmission unit to the second communication terminal. A transmission control stage.

  In the sixth embodiment of the present invention, a communication control program for a communication control device that controls packet communication of voice data between a first communication terminal and a second communication terminal that is a communication partner of the first communication terminal. A communication control device includes a data receiving unit that receives a voice packet transmitted by the first communication terminal, a data transmission unit that transmits a voice packet received by the data receiving unit to the second communication terminal, and a second communication terminal. A communication enable / disable determining unit that determines whether a voice packet can be transmitted from the data transmitting unit to the second communication terminal based on an electric field strength from an external communication relay device that relays the communication to the second communication terminal; When the determination unit determines that the voice packet cannot be transmitted from the data transmission unit to the second communication terminal, the data recording unit for recording the voice data indicated by the voice packet to be transmitted by the data transmission unit, When the data recording unit records voice data, it detects that a voice packet can be transmitted from the data transmission unit to the second communication terminal based on the electric field strength from the communication relay device to the second communication terminal. When the transmittable detection unit and the transmittable detection unit detect that the voice packet can be transmitted from the data transmission unit, a voice packet indicating the voice data recorded by the data recording unit is received from the data transmission unit. 2 function as a transmission control unit for transmitting to a communication terminal.

  Further, in the seventh embodiment of the present invention, a communication terminal that performs voice data packet communication with a communication partner communication terminal, and a communication that controls voice data packet communication between the communication terminal and the communication partner communication terminal. A communication terminal including a control device, wherein a communication terminal is generated by a voice input unit that inputs voice, a voice packet generation unit that generates a voice packet indicating voice input by the voice input unit, and a voice packet generation unit By monitoring the electric field strength from the data transmission unit that transmits the voice packet to the communication terminal of the communication partner and the external communication relay device that relays communication with the communication terminal of the communication partner, the data transmission unit to the communication partner The communication availability determination unit that determines whether or not the voice packet can be transmitted to the communication terminal and the communication availability determination unit have determined that the voice packet cannot be transmitted from the data transmission unit. In this case, when the data recording unit records the voice data indicated by the voice packet to be transmitted by the data transmission unit and the data recording unit records the voice data, the data strength is monitored by monitoring the electric field strength from the communication relay device. A transmission possible detection unit that detects that a voice packet can be transmitted from the transmission unit, and a data recording unit when the transmission possible detection unit detects that a voice packet can be transmitted from the data transmission unit. Has a transmission control unit that transmits a voice packet indicating the voice data recorded by the data transmission unit to the communication terminal of the communication partner.

  In the eighth embodiment of the present invention, a communication terminal that performs voice data packet communication with a communication partner communication terminal, and a communication that controls voice data packet communication between the communication terminal and the communication partner communication terminal. A communication method in which a communication terminal in a communication system including a control device performs packet communication of voice data, a voice input stage for inputting voice, and a voice packet for generating voice packets indicating voice inputted in the voice input stage Data transmission that transmits the voice packet generated in the voice packet generation stage to the communication terminal of the communication partner by monitoring the electric field strength from the external communication relay device that relays the communication with the communication terminal of the communication partner in the generation stage In the communication availability determination stage for determining whether transmission is possible from the communication section and the communication availability determination stage, the voice packet is transmitted from the data transmission section. If the data transmission unit records the voice data indicated by the voice packet to be transmitted and the voice data is recorded at the data recording step, the electric field strength from the communication relay device is determined. Detecting that the voice transmitter can be transmitted from the data transmitter, and detecting that the voice transmitter can be transmitted from the data transmitter in the transmittable detection stage. In this case, there is a transmission control stage in which a voice packet indicating the voice data recorded in the data recording stage is transmitted from the data transmission unit to the communication terminal of the communication partner.

  In the ninth embodiment of the present invention, a communication terminal that performs voice data packet communication with a communication partner communication terminal, and a communication that controls voice data packet communication between the communication terminal and the communication partner communication terminal. A communication program for a communication system including a control device, a communication terminal of the communication system, a voice input unit that inputs voice, a voice packet generation unit that generates voice packets indicating voice input by the voice input unit, and voice A data transmission unit that transmits a voice packet generated by the packet generation unit to a communication terminal of a communication partner, and a data transmission unit by monitoring an electric field strength from an external communication relay device that relays communication with the communication terminal of the communication partner A communication enable / disable determining unit for determining whether or not a voice packet can be transmitted from the data transmitting unit to the communication terminal of the communication partner, When it is determined that transmission is not possible, a data recording unit that records voice data indicated by a voice packet to be transmitted by the data transmission unit, and when the data recording unit records voice data, the electric field strength from the communication relay device is monitored. By this means, when the transmittable detection unit that detects that a voice packet can be transmitted from the data transmission unit, the transmittable detection unit detects that the voice packet can be transmitted from the data transmission unit, A voice packet indicating the voice data recorded by the data recording unit is caused to function as a transmission control unit that transmits from the data transmission unit to the communication terminal of the communication partner.

  In the tenth aspect of the present invention, voice data packet communication between the first communication terminal and the second communication terminal which is the communication partner of the first communication terminal, and the first communication terminal and the second communication terminal. The communication control device includes a data receiving unit that receives a voice packet transmitted from the first communication terminal, and the voice packet received by the data receiving unit to the second communication terminal. Can voice packets be transmitted from the data transmission unit to the second communication terminal based on the electric field strength from the external communication relay device that relays communication between the data transmission unit to be transmitted and the second communication terminal to the second communication terminal The voice packet to be transmitted by the data transmission unit is indicated when the communication availability judgment unit and the communication availability judgment unit judge whether or not the voice packet cannot be transmitted from the data transmission unit to the second communication terminal. A data recording unit for recording voice data; and when the data recording unit records audio data, an audio packet is transmitted from the data transmission unit to the second communication terminal based on the electric field strength from the communication relay device to the second communication terminal. Audio that is recorded by the data recording unit when the transmittable detection unit that detects that transmission is possible and the transmittability detection unit detects that audio packets can be transmitted from the data transmission unit A transmission control unit for transmitting a voice packet indicating data from the data transmission unit to the second communication terminal.

  In the eleventh aspect of the present invention, packet communication of voice data between the first communication terminal and the second communication terminal that is the communication partner of the first communication terminal, and the first communication terminal and the second communication terminal. A communication control method in which a communication control apparatus in a communication system including a communication control apparatus for controlling communication controls communication, a data reception stage for receiving a voice packet transmitted by a first communication terminal, and communication with a second communication terminal The voice packet from the data transmission unit that transmits the voice packet received in the data reception stage to the second communication terminal to the second communication terminal based on the electric field strength from the external communication relay device that relays the second communication terminal. When it is determined that the voice packet cannot be transmitted from the data transmission unit to the second communication terminal in the communication availability determination stage and the communication availability determination stage. A data recording stage for recording the voice data indicated by the voice packet to be transmitted by the data transmission unit, and when the voice data is recorded in the data recording stage, the data is based on the electric field strength from the communication relay apparatus to the second communication terminal. When it is detected that a voice packet can be transmitted from the data transmission unit in the transmittable detection stage for detecting that the voice packet can be transmitted from the transmitter to the second communication terminal, and the transmittable detection stage. And a transmission control step of transmitting a voice packet indicating the voice data recorded in the data recording step from the data transmission unit to the second communication terminal.

  Further, in the twelfth aspect of the present invention, voice data packet communication between the first communication terminal and the second communication terminal which is the communication partner of the first communication terminal, and the first communication terminal and the second communication terminal. A communication control program for a communication system comprising a communication control device for controlling the communication control device, wherein the communication control device includes a data receiving unit for receiving a voice packet transmitted by the first communication terminal, and a voice packet received by the data receiving unit. 2 based on the electric field strength from the external communication relay device that relays communication with the second communication terminal to the second communication terminal, the voice packet from the data transmission unit to the second communication terminal. The sound to be transmitted by the data transmission unit when the communication availability determination unit and the communication availability determination unit determine whether or not transmission is possible, from the data transmission unit to the second communication terminal. A data recording unit that records audio data indicated by the packet, and when the data recording unit records audio data, the audio is transmitted from the data transmission unit to the second communication terminal based on the electric field strength from the communication relay device to the second communication terminal. The data recording unit records when the transmittable detection unit that detects that a packet can be transmitted and the transmittable detection unit detect that a voice packet can be transmitted from the data transmission unit. A voice packet indicating voice data is caused to function as a transmission control unit that transmits the voice packet from the data transmission unit to the second communication terminal.

  The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

  According to the present invention, even when the communication terminal moves out of the service area, the communication content can be transmitted to the communication terminal of the communication partner as long as the communication content can be understood.

  Hereinafter, the present invention will be described through embodiments of the invention. However, the following embodiments do not limit the claimed invention, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

  FIG. 1 shows an outline of a communication system according to an embodiment of the present invention. The communication system includes a plurality of communication terminals 10, a communication control device 20, and a plurality of communication relay devices 30. The plurality of communication terminals 10 are respectively controlled by the communication control device 20 and communicate with the communication terminal 10 of the communication partner via the communication relay device 30 and the network 40. The plurality of communication terminals 10 communicate with the communication terminal 10 of the communication partner using, for example, a half-duplex Push-To-Talk (PTT) communication method.

  When the communication terminal 10 or the communication control apparatus 20 according to the present embodiment returns to the area again after the communication terminal 10 moves out of the service area, the user who uses the communication terminal 10 that is the communication partner of the communication terminal 10 It is an object to transmit voice data indicating the communication content to the communication terminal 10 as a communication partner within a range in which the communication content can be understood.

  First, the communication terminal 10 (A) establishes a session of the PTT communication method with a plurality of other communication terminals 10. Specifically, the communication terminal 10 (A) communicates an INVITE message indicating that communication with the plurality of other communication terminals 10 by the PTT communication method is desired via the communication relay device 30 (A) and the network 40. It transmits to the control apparatus 20. The communication relay device 30 is, for example, a mobile phone base station. Moreover, the communication control apparatus 20 is a SIP server, for example. Note that the communication relay device 30 may include some or all of the functions and configurations of the communication control device 20. Further, the communication control device 20 and the communication relay device 30 may be provided with all the functions and configurations of the communication control device 20.

  Then, the communication control device 20 transmits an INVITE message to the other plurality of communication terminals 10 (for example, the communication terminal 10 (B), the communication terminal 10 (C), and the communication terminal 10 (D)). Subsequently, when a message (for example, 200 OK) indicating that the communication by the PTT communication method is accepted is transmitted from the plurality of other communication terminals 10 to the communication control apparatus 20, and the communication terminal 10 (A) receives the message, the communication is performed. A session using the PTT communication method is established between the terminal 10 (A) and another communication terminal 10. Thereby, the communication terminal 10 (A) can communicate with the plurality of other communication terminals 10 by the PTT communication method.

  Next, consider a case where the communication terminal 10 (A) is in a state where voice data can be transmitted to each of a plurality of other communication terminals 10 in the communication of the PTT communication method, that is, a case where the communication terminal 10 (A) has the right to speak. In such a case, when the communication terminal 10 (A) moves out of service area while transmitting a voice packet, that is, the electric field strength from the communication relay device 30 (A) to the communication terminal 10 (A) becomes a predetermined value or less, and PTT When continuation of communication in the communication method becomes impossible, the communication terminal 10 (A) records the voice uttered by the user who uses the communication terminal 10 (A) as voice data.

  When the communication terminal 10 (A) returns to the service area within a predetermined first time (for example, 3 seconds), the communication terminal 10 (A) transmits a voice packet indicating the recorded voice data. It transmits to the communication relay apparatus 30 (A). The communication relay device 30 (A) transmits the received voice packet to the communication control device 20 via the network 40. The communication control device 20 is connected to the communication terminal 10 (B), the communication terminal 10 (C), and the communication terminal 10 (D) via the network 40, the communication relay device 30 (A), and the communication relay device 30 (B). The voice packet received from the communication terminal 10 (A) is transmitted to each.

  On the other hand, when the communication terminal 10 (A) does not return to the service area within the first predetermined time, the communication terminal 10 (A) deletes the recorded voice data. Thereby, when the communication terminal 10 (A) returns to the service area within a predetermined first time, a voice packet indicating the recorded voice data is transmitted to a plurality of communication terminals 10 of communication partners. On the other hand, since the recorded voice data is erased when a predetermined first time has elapsed, the voice uttered by the user who uses the communication terminal 10 (A) in the plurality of communication terminals 10 of the communication partner Can be prevented from occurring.

  In addition, when the communication terminal 10 (A) does not return to the area before a predetermined second time (for example, 30 seconds) longer than the first time elapses, the communication terminal 10 ( A) automatically disconnects a session established between the communication terminal 10 (A) and another communication terminal 10. Thus, when the predetermined second time has elapsed after the communication terminal 10 (A) has moved out of the service area, the communication terminal 10 (A) can disconnect the session. When it is detected that the terminal 10 (A) has moved out of service and the session has already been disconnected, the communication terminal 10 (A) does not recognize that the session still exists, and the communication terminal 10 There will be no inconsistency between the recognition of session continuation / disconnection between (A) and the communication control device 20.

  FIG. 2 shows an example of the functional configuration of the communication terminal 10 according to the present embodiment. The communication terminal 10 is a communication terminal that performs voice data packet communication, and is specifically a mobile phone terminal. For example, the communication terminal 10 is a mobile phone terminal that performs voice data packet communication using the PTT communication method, which is a half-duplex communication method. The communication terminal 10 may be a notebook personal computer, a PDA, a portable information terminal such as a game machine, and a desktop PC having a function of performing voice data packet communication. The communication terminal 10 includes a voice input unit 100, a voice output unit 105, a terminal side data transmission unit 110, a terminal side data reception unit 115, a terminal side communication control unit 120, a terminal side data recording unit 130, a voice packet generation unit 135, a communication A mode setting unit 140, a terminal-side communication availability determination unit 150, a terminal-side transmission capability detection unit 155, a terminal-side timer unit 160, a terminal-side data erasure unit 170, and a terminal-side field strength detection unit 180 are provided.

  The terminal-side communication control unit 120 includes a terminal-side transmission control unit 122, a terminal-side reception control unit 124, and a terminal-side communication control unit 126. The terminal-side timer unit 160 includes a terminal-side first timer 162 and a terminal-side second timer 164. Terminal-side data transmission unit 110, terminal-side data reception unit 115, terminal-side transmission control unit 122, terminal-side data recording unit 130, terminal-side communication availability determination unit 150, terminal-side transmission capability detection unit 155, and terminal-side data The erasure unit 170 includes a data transmission unit, a data reception unit, a communication availability determination unit, a transmission availability detection unit, a data recording unit, a data erasure unit, and a data transmission unit according to claims 9 to 13, respectively, It is an example of a transmission control unit.

  The voice input unit 100 inputs a voice uttered by a user who uses the communication terminal 10 and a voice around the communication terminal 10. The voice input unit 100 supplies voice data indicating the input voice to the voice packet generation unit 135 and the terminal-side data recording unit 130. The voice packet generation unit 135 generates a voice packet indicating the voice received from the voice input unit 100. Specifically, the voice packet generation unit 135 encodes and packetizes a digital voice signal having a predetermined sampling frequency obtained by AD-converting the analog voice signal input by the voice input unit 100 to generate a voice packet. Is generated. Further, the voice packet generation unit 135 generates a voice packet indicating the voice data received from the terminal-side data recording unit 130. The voice packet generation unit 135 supplies the generated voice packet to the terminal-side data transmission unit 110 and the terminal-side data recording unit 130.

  The terminal-side data transmission unit 110 transmits the voice packet received from the voice packet generation unit 135 to the communication terminal 10 of the communication partner. The terminal-side data transmission unit 110 is controlled by the terminal-side transmission control unit 122 included in the terminal-side communication control unit 120 to generate a voice packet when the communication terminal 10 is set in a transmission mode for transmitting a voice packet. The voice packet received from the unit 135 is transmitted to the communication terminal 10 of the communication partner. The terminal-side reception control unit 124 controls the terminal-side data reception unit 115 to receive a voice packet transmitted from the communication terminal 10 as a communication partner. The terminal-side data receiving unit 115 receives the voice packet transmitted from the communication terminal 10 that is the communication partner. That is, the terminal-side data receiving unit 115 is controlled by the terminal-side reception control unit 124 included in the terminal-side communication control unit 120, and the communication is performed when the communication terminal 10 is set to the reception mode for receiving voice packets. A voice packet is received from the partner communication terminal 10. The terminal-side data receiving unit 115 supplies the received voice packet to the voice output unit 105.

  The voice output unit 105 outputs the voice indicated by the voice packet received from the terminal-side data receiving unit 115. The terminal-side electric field strength detection unit 180 detects the electric field strength from the communication relay device 30. The terminal-side electric field strength detection unit 180 always detects the electric field strength from the communication relay device 30. The terminal-side electric field strength detection unit 180 may detect the electric field strength from the communication relay device 30 at a predetermined time interval. For example, the terminal-side electric field strength detection unit 180 detects the electric field strength from the communication relay device 30 at a time interval shorter than a first time measured by a terminal-side first timer 162 described later. The terminal-side electric field strength detection unit 180 supplies information indicating the detected electric field strength to the terminal-side communication availability determination unit 150 and the terminal-side transmission capability detection unit 155.

  The terminal-side communication availability determination unit 150 monitors the electric field strength from the external communication relay device 30 that relays communication with the communication partner communication terminal 10, thereby allowing the terminal-side data transmission unit 110 to communicate with the communication partner communication terminal 10. It is determined whether or not a voice packet can be transmitted. Specifically, the terminal-side communication enable / disable determining unit 150 determines that when the electric field strength indicated by the information received from the terminal-side electric field strength detecting unit 180 is equal to or lower than a predetermined threshold value, the terminal-side communication feasibility determining unit 150 It is determined that voice packets cannot be transmitted. The terminal-side communication availability determination unit 150 transmits a voice packet to the communication terminal 10 of the communication partner when the electric field strength indicated by the information received from the terminal-side electric field strength detection unit 180 exceeds a predetermined threshold. Judge that you can. The terminal-side communication availability determination unit 150 supplies determination result information indicating the determination result to the terminal-side data recording unit 130 and the terminal-side data erasing unit 170. Further, the terminal-side communication availability determination unit 150 determines whether the terminal-side timer unit 160 has the first terminal-side first at the timing when it is determined whether the voice packet can be transmitted from the terminal-side data transmission unit 110 to the communication terminal 10 of the communication partner. The timer 162 and the terminal-side second timer 164 are started.

  The terminal-side data recording unit 130 transmits the terminal-side data transmission unit 110 when the determination result information received from the terminal-side communication availability determination unit 150 indicates that the voice packet cannot be transmitted from the terminal-side data transmission unit 110. Voice data indicated by the voice packet to be recorded is recorded. The terminal-side data recording unit 130 receives the determination result information from the terminal-side communication availability determination unit 150 when the received determination result information indicates that the voice packet cannot be transmitted from the terminal-side data transmission unit 110. The voice data indicating the voice input by the voice input unit 100 is recorded. Further, when the received determination result information indicates that the voice packet cannot be transmitted from the terminal side data transmission unit 110, the terminal side data recording unit 130 receives the determination result information from the terminal side communication availability determination unit 150. From time to time, the audio data indicated by the audio packet generated by the audio packet generator 135 may be recorded.

  Further, even when the terminal-side data recording unit 130 does not receive the determination result information from the terminal-side communication availability determination unit 150, the voice data indicating the voice input by the voice input unit 100 or the voice packet generation unit 135 is always displayed. The voice data indicated by the generated voice packet may be recorded with the data recording capacity of the terminal-side data recording unit 130 as the upper limit. Then, the terminal-side data recording unit 130 newly receives the voice data input by the voice input unit 100 until the received voice data or the voice data indicated by the voice packet is received from the terminal-side communication availability determination unit 150. The recording of the voice data or the voice data indicated by the voice packet may be repeated in place of the data or voice data indicated by the voice packet newly generated by the voice packet generation unit 135. The terminal-side data recording unit 130 is controlled by the terminal-side transmission control unit 122 to supply the recorded voice data to the voice packet generation unit 135. Further, the terminal-side data recording unit 130 supplies information indicating that the audio data has been recorded to the terminal-side transmission capability detection unit 155.

  The terminal-side transmission capability detection unit 155 can transmit voice packets from the terminal-side data transmission unit 110 by monitoring the electric field strength from the communication relay device 30 when the terminal-side data recording unit 130 records voice data. Detects that the status has been reached. Specifically, the terminal-side transmission capability detection unit 155 continuously monitors the electric field strength indicated by the information received from the terminal-side electric field strength detection unit 180, and the electric field strength being monitored exceeds a predetermined threshold. If it is detected, it is detected that the voice packet can be transmitted to the communication terminal 10 of the communication partner. When the terminal-side transmission capability detection unit 155 detects that the voice packet can be transmitted to the communication terminal 10 of the communication partner, the terminal-side transmission control unit 122 and the terminal-side data erasure unit receive information indicating the detection result. 170.

  The terminal-side first timer 162 is activated under the control of the terminal-side communication availability determination unit 150 and measures a predetermined first time (for example, 3 seconds). The terminal-side first timer 162 notifies the terminal-side transmission control unit 122 and the terminal-side data erasing unit 170 of the timing at which the first time measurement is started and the timing at which the first time measurement is completed. The terminal-side second timer 164 is activated under the control of the terminal-side communication availability determination unit 150 and is set to a predetermined second time (for example, longer than the first time measured by the terminal-side first timer 162) (for example, 30 seconds). The terminal-side second timer 164 notifies the terminal-side communication control unit 126 of the timing at which the second time measurement is started and the timing at which the second time measurement is completed.

  The terminal-side transmission control unit 122 records the terminal-side data recording unit 130 when the terminal-side transmission capability detection unit 155 detects that the voice packet can be transmitted from the terminal-side data transmission unit 110. The voice packet indicating the voice data being transmitted is transmitted from the terminal-side data transmission unit 110 to the communication terminal 10 of the communication partner. Specifically, when the terminal-side transmission control unit 122 receives information indicating a detection result indicating that a voice packet can be transmitted from the terminal-side transmission capability detection unit 155 to the communication terminal 10 of the communication partner. The terminal-side data recording unit 130 and the terminal-side data transmitting unit 110 are configured to transmit the voice packet indicating the voice data recorded by the terminal-side data recording unit 130 from the terminal-side data transmitting unit 110 to the communication terminal 10 of the communication partner. To control the operation. That is, the terminal-side transmission control unit 122 controls the terminal-side data recording unit 130 to supply the voice packet generation unit 135 with the voice data recorded by the terminal-side data recording unit 130. And the terminal side transmission control part 122 controls the terminal side data transmission part 110, and transmits the voice packet which the voice packet generation part 135 produced | generated to the communication terminal 10 of a communicating party.

  Also, the terminal-side transmission control unit 122 starts from the time when the terminal-side communication availability determination unit 150 determines that the voice packet cannot be transmitted until the predetermined first time elapses. When it is detected that the voice packet can be transmitted, the voice packet indicated by the voice data recorded by the terminal-side data recording unit 130 is transmitted from the terminal-side data transmission unit 110 to the communication terminal 10 of the communication partner. Send it. Specifically, the terminal-side transmission control unit 122 starts from the terminal-side first timer 162 when the timing at which the first time measurement starts is notified, and then the terminal-side transmission capability detection unit 155 communicates with the communication terminal of the communication partner. When the time until receiving the information indicating that the voice packet can be transmitted to 10 is received is shorter than the first time, the terminal-side data recording unit 130 is acted on and the terminal-side data recording is performed. The voice packet indicated by the voice data recorded by the unit 130 is transmitted from the terminal-side data transmission unit 110 to the communication terminal 10 of the communication partner.

  The terminal-side data erasure unit 170 transmits the voice packet after the first time elapses after the terminal-side communication availability determination unit 150 determines that the voice packet cannot be transmitted. When it is not detected that the terminal is ready, the voice data recorded by the terminal-side data recording unit 130 is deleted. Specifically, the terminal-side data erasure unit 170 receives the first time from the terminal-side first timer 162 when the determination result information received from the terminal-side communication availability determination unit 150 indicates that the voice packet cannot be transmitted. It shows that it has become a state where voice packets can be transmitted from the terminal-side transmission capability detection unit 155 to the communication terminal 10 of the communication partner until the first time elapses from when the measurement start timing is notified. If no detection result is received, the audio data recorded by the terminal-side data recording unit 130 is deleted.

  The communication mode setting unit 140 is a reception mode in which the terminal-side data receiving unit 115 receives the voice packet and the voice output unit 105 outputs the voice. The voice input unit 100 inputs the voice and the terminal-side data transmission unit 110 receives the voice packet. The communication mode of the communication terminal 10 is set to one of the transmission modes for transmitting. The terminal-side communication control unit 126 starts from when the terminal-side communication availability determination unit 150 determines that the voice packet cannot be transmitted until a predetermined second time longer than the predetermined first time elapses. On the other hand, when the terminal-side transmission capability detection unit 155 does not detect that the voice packet can be transmitted, the half-duplex communication with the communication terminal 10 of the communication partner is terminated.

  Specifically, the terminal-side communication control unit 126 is notified from the terminal-side second timer 164 of the timing when the second time measurement is started, from the terminal-side transmission capability detection unit 155 to the communication partner communication terminal. When the time until receiving the information indicating that the voice packet can be transmitted to 10 exceeds the second time, half-duplex communication with the communication partner communication terminal 10 is performed. In order to end the process, the terminal side data transmission unit 110 and the terminal side data reception unit 115 are controlled.

  According to the communication terminal 10 according to the present embodiment, when the communication terminal 10 moves out of the service area, the voice uttered by the user is recorded as sound data, and the communication terminal 10 returns to the service area within a predetermined time. In addition, the voice data recorded immediately can be automatically transmitted to the communication terminal 10 of the communication partner. Thus, when the communication terminal 10 moves out of the service area and returns to the service area in a short time, the voice data transmitted to the communication terminal 10 of the communication partner is prevented from being lost, and the communication partner 10 In the communication terminal 10, it is possible to suppress the occurrence of voice skipping.

  Further, according to the communication terminal 10 according to the present embodiment, when the communication terminal 10 has been out of service for a long time in a state where a communication session of the PTT communication method is established with the communication terminal 10 of the communication partner. The communication terminal 10 can automatically disconnect the session. As a result, the state of the communication terminal 10 ascertained by the communication control device 20 does not match the state of the communication terminal 10.

  FIG. 3 shows an example of the flow of processing in the communication terminal 10 according to the present embodiment. First, the voice input unit 100 inputs voice (S1000). The voice input unit 100 supplies voice data indicating the input voice to the voice packet generation unit 135. The voice packet generation unit 135 generates a voice packet indicating the voice data received from the voice input unit 100 (S1010). In this case, the terminal-side electric field strength detection unit 180 detects whether the terminal-side communication availability determination unit 150 can transmit a voice packet from the terminal-side data transmission unit 110 to the communication terminal 10 of the communication partner. Judgment is made from the electric field strength (S1015). That is, the terminal-side communication enable / disable determining unit 150 determines whether the communication terminal 10 exists within the area or outside the area.

  When the terminal-side communication availability determination unit 150 determines that the communication terminal 10 is outside the service area (S1015: Yes), the terminal-side data recording unit 130 records audio data indicating the audio input by the audio input unit 100. (S1020). In such a case, the terminal-side first timer 162 started when the terminal-side communication availability determination unit 150 determines that the voice packet cannot be transmitted, that is, when the communication terminal 10 is out of service area, is measured. If the communication terminal 10 has not returned to the service area until the first time has elapsed (S1025: Yes), the terminal-side data erasure unit 170 erases the audio data recorded by the terminal-side data recording unit 130 (S1030). ).

  On the other hand, when the terminal-side communication availability determination unit 150 determines that the communication terminal 10 is within the range (S1015: No), and when the communication terminal 10 is outside the range, the first time elapses. When the communication terminal 10 has returned to the service area by the time (S1025: No), the terminal-side transmission control unit 122 transmits the voice packet indicating the voice data recorded by the terminal-side data recording unit 130 to the terminal-side data transmission. The unit 110 transmits the data to the communication terminal 10 of the communication partner (S1035). When the communication terminal 10 releases the speech right (S1045: Yes), the communication terminal 10 ends the process. If the communication terminal 10 still has the right to speak (S1045: No), the voice input unit 100 continues to input voice.

  Then, when the terminal-side communication enable / disable determining unit 150 determines that the voice packet cannot be transmitted, the communication terminal 10 is within the range until a predetermined second time measured by the terminal-side second timer 164 elapses. When not returning (S1040: Yes), the terminal side communication control part 126 complete | finishes half-duplex communication with the communication terminal 10 of a communicating party (S1050). On the other hand, from when the terminal-side communication enable / disable determining unit 150 determines that the voice packet cannot be transmitted, the communication terminal 10 is within the range until the second predetermined time measured by the terminal-side second timer 164 elapses. When returning (S1040: No), the voice input unit 100 continues to input voice.

  FIG. 4 shows an example of a functional configuration of the communication control apparatus 20 according to another embodiment. The communication control device 20 controls voice data packet communication between the first communication terminal and the second communication terminal which is the communication partner of the first communication terminal. The communication control device 20 is a SIP server, for example. Further, the first communication terminal and the second communication terminal may have a part of the function and configuration of the communication terminal 10 in the above description of FIGS. The communication control device 20 includes a control-side data transmission unit 210, a control-side data reception unit 215, a control-side transmission control unit 222, a control-side communication control unit 226, a control-side data recording unit 230, a control-side communication availability determination unit 250, a control A transmission-side detection unit 255, a control-side timer unit 260, a control-side data erasing unit 270, and a control-side electric field strength detection unit 280. The control side timer unit 260 includes a control side first timer 262 and a control side second timer 264. The control-side data transmission unit 210, the control-side data reception unit 215, the control-side transmission control unit 222, the control-side data recording unit 230, the control-side communication availability determination unit 250, and the control-side transmission capability detection unit 255 are respectively connected An example of a data transmission unit, a data reception unit, a communication availability determination unit, a transmission enable detection unit, a data recording unit, a data erasing unit, and a transmission control unit according to claims according to the control device and claims 14 to 16 It is.

  The control side data receiving unit 215 receives the voice packet transmitted by the first communication terminal. The control-side data receiving unit 215 supplies the received voice packet to the control-side data recording unit 230 based on the control of the control-side transmission control unit 222. The control side data transmission unit 210 transmits the voice packet received by the control side data reception unit 215 to the second communication terminal. The control side data transmission unit 210 is controlled by the control side transmission control unit 222 to transmit the voice packet received from the control side data recording unit 230 to the second communication terminal. The control-side electric field strength detection unit 280 detects the electric field strength from the communication relay device 30 to the second communication terminal. The control-side electric field strength detection unit 280 supplies information indicating the detected electric field strength to the control-side communication availability determination unit 250 and the control-side transmission capability detection unit 255.

  Based on the electric field strength from the external communication relay device 30 to the second communication terminal received from the control-side electric field strength detection unit 280, the control-side communication availability determination unit 250 transmits the control-side data transmission unit 210 to the second communication terminal. Determines whether or not a voice packet can be transmitted. Specifically, the control-side communication availability determination unit 250 transmits a voice packet to the second communication terminal when the field strength indicated by the information received from the control-side field strength detection unit 280 is equal to or less than a predetermined threshold. Is determined not to be sent. In addition, the control-side communication availability determination unit 250 can transmit a voice packet to the second communication terminal when the electric field strength indicated by the information received from the control-side electric field strength detection unit 280 exceeds a predetermined threshold. to decide. The control-side communication availability determination unit 250 supplies determination result information indicating the determination result to the control-side data recording unit 230 and the control-side data erasing unit 270. The control-side communication availability determination unit 250 determines whether the control-side timer unit 260 has the control-side first timer 262 at a timing when it is determined whether the control-side data transmission unit 210 can transmit a voice packet to the second communication terminal. And the control side second timer 264 is started.

  The control-side data recording unit 230 transmits the control-side data transmission when the determination result information received from the control-side communication availability determination unit 250 indicates that the voice packet cannot be transmitted from the control-side data transmission unit 210 to the second communication terminal. The voice data indicated by the voice packet to be transmitted by the unit 210 is recorded. When the received determination result information indicates that the voice packet cannot be transmitted from the control side data transmission unit 210 to the second communication terminal, the control side data recording unit 230 uses the determination result information as the control side communication availability determination unit 250. The voice data indicated by the voice packet received by the control-side data receiving unit 215 is recorded after the data is received. On the other hand, if the determination result information received from the control-side communication availability determination unit 250 indicates that the voice data can be transmitted from the control-side data transmission unit 210 to the second communication terminal, the control-side data recording unit 230 The voice data received from the data receiving unit 215 is transferred to the control side data transmitting unit 210. The control-side data transmission unit 210 transmits a voice packet indicating the voice data transferred from the control-side data recording unit 230 to the second communication terminal.

  Further, even when the control-side data recording unit 230 does not receive the determination result information from the control-side communication availability determination unit 250, the control-side data reception unit 215 always receives the audio data received by the control-side data recording unit 230. The data recording capacity may be recorded as an upper limit. Then, the control-side data recording unit 230 replaces the recorded audio data with the audio data newly received by the control-side data reception unit 215 until receiving the determination result information from the control-side communication availability determination unit 250. Recording of audio data may be repeated. The control side data recording unit 230 is controlled by the control side transmission control unit 222 to supply the control side data transmission unit 210 with a voice packet indicated by the recorded voice data. In addition, the control-side data recording unit 230 supplies information indicating that the audio data has been recorded to the control-side transmission capability detection unit 255.

  When the control-side data recording unit 230 records audio data, the control-side transmission capability detection unit 255 monitors the electric field strength from the communication relay device 30 to the second communication terminal, thereby controlling the control-side data transmission unit 210. It is detected that a voice packet can be transmitted to the second communication terminal. Specifically, the control-side transmission capability detection unit 255 constantly monitors the electric field strength indicated by the information received from the control-side electric field strength detection unit 280, and the electric field strength being monitored exceeds a predetermined threshold. If it is detected, it is detected that the voice packet can be transmitted to the second communication terminal. When the control-side transmission-capable detection unit 255 detects that the voice packet can be transmitted to the second communication terminal, the control-side transmission control unit 255 sends information indicating the detection result to the control-side transmission control unit 222, the control-side communication control unit 226, and The data is supplied to the control side data erasing unit 270.

  The control-side first timer 262 is activated under the control of the control-side communication availability determination unit 250 and measures a predetermined first time (for example, 3 seconds). The control-side first timer 262 indicates the timing at which the first time measurement is started and the timing at which the first time measurement is completed as the control-side transmission control unit 222, the control-side communication control unit 226, and the control-side data erasure. Notification to the unit 270. The control-side second timer 264 is activated under the control of the control-side communication availability determination unit 250 and is set to a predetermined second time (for example, longer than the first time measured by the control-side first timer 262, for example). 30 seconds). The control-side second timer 264 notifies the control-side communication control unit 226 of the timing at which the second time measurement is started and the timing at which the second time measurement is completed.

  The control-side transmission control unit 222 records the control-side data recording unit 230 when the control-side transmission enable detection unit 255 detects that the control-side data transmission unit 210 can transmit voice packets. A voice packet indicating the voice data being transmitted is transmitted from the control-side data transmission unit 210 to the second communication terminal. Specifically, when the control-side transmission control unit 222 receives information indicating a detection result indicating that a voice packet can be transmitted from the control-side transmission capability detection unit 255 to the second communication terminal, The operation of the control-side data recording unit 230 and the control-side data transmission unit 210 is performed so as to transmit the voice packet indicating the voice data recorded by the side-side data recording unit 230 from the control-side data transmission unit 210 to the second communication terminal. Control.

  In addition, the control-side transmission control unit 222 controls the control-side communication availability determination unit 250 from the time when it is determined that the voice packet cannot be transmitted to the second communication terminal until the first predetermined time elapses. When the transmittable detection unit 255 detects that the voice packet can be transmitted to the second communication terminal, the control side data recording unit 230 transmits the voice packet indicated by the voice data recorded by the control side data recording unit 230. The unit 210 transmits to the second communication terminal. Specifically, the control-side transmission control unit 222 is notified from the control-side first timer 262 of the timing at which the measurement of the first time is started to the second communication terminal from the control-side transmission capability detection unit 255. When the time until receiving the information indicating that it is detected that the voice packet can be transmitted is shorter than the first time, the control side data recording unit 230 is acted on, and the control side data recording unit 230 is operated. Is transmitted from the control-side data transmission unit 210 to the second communication terminal 10.

  The control-side data erasure unit 270 transmits the voice packet after the first time elapses after the control-side communication availability determination unit 250 determines that the voice packet cannot be transmitted. When it is not detected that the ready state is reached, the control-side data recording unit 230 deletes the audio data recorded. Specifically, the control-side data erasure unit 270 receives the first time from the control-side first timer 262 when the determination result information received from the control-side communication availability determination unit 250 indicates that the voice packet cannot be transmitted. Detection result indicating that a voice packet can be transmitted from the control-side transmission enable detection unit 255 to the second communication terminal from when the measurement start timing is notified until the first time elapses. Is not received, the audio data recorded by the control-side data recording unit 230 is erased.

  The control-side communication control unit 226 determines the second predetermined time longer than the predetermined first time from when the control-side communication availability determination unit 250 determines that the voice packet cannot be transmitted to the second communication terminal. Half-duplex communication with the second communication terminal is terminated when the control-side transmittable detection unit 255 does not detect that the voice packet can be transmitted to the second communication terminal before the time elapses. To do. Specifically, the control-side communication control unit 226 is notified from the control-side second timer 264 to the second communication terminal from the control-side transmittable detection unit 255 when notified of the timing when the second time measurement is started. Half-duplex communication with the second communication terminal is terminated when the time until receiving the information indicating that it is detected that the voice packet can be transmitted exceeds the second time.

  According to the communication control apparatus 20 according to the present embodiment, the fact that the second communication terminal that is receiving voice data from the first communication terminal has moved out of service while the first communication terminal and the second communication terminal are communicating. When detected, the voice data transmitted by the first communication terminal can be recorded, and the voice data recorded when the second communication terminal returns to the service area can be transmitted to the second communication terminal. As a result, even if the second communication terminal that receives the voice data exists outside the service area for a short period of time, the voice indicated by the voice data transmitted by the first communication terminal is transmitted to the second communication terminal within a range in which the voice delay is not felt. Can be output.

  FIG. 5 shows an example of the flow of processing in the communication control apparatus 20 according to another embodiment. First, the control-side data receiving unit 215 receives a voice packet from the first communication terminal (S2000). The control-side data receiving unit 215 supplies the audio data indicated by the received audio packet to the control-side data recording unit 230. The control-side communication availability determination unit 250 determines whether or not a voice packet can be transmitted from the control-side data transmission unit 210 to the second communication terminal based on the electric field strength detected by the control-side field strength detection unit 280 ( S2005). That is, the control-side communication availability determination unit 250 determines whether the second communication terminal exists within the area or outside the area.

  When the control-side communication availability determination unit 250 determines that the second communication terminal is outside the service area (S2005: Yes), the control-side data recording unit 230 indicates the audio data indicating the audio received by the control-side data reception unit 215. Is recorded (S2010). In such a case, when the control-side communication availability determination unit 250 determines that the voice packet cannot be transmitted to the second communication terminal, that is, when the second communication terminal is out of service area, When the second communication terminal does not return to the service area until the first time measured by the first timer 262 elapses (S2015: Yes), the control-side data erasure unit 270 records the control-side data recording unit 230 The audio data is deleted (S2020).

  On the other hand, when the control-side communication enable / disable determining unit 250 determines that the second communication terminal is within the service area (S2005: No), and when the second communication terminal is out of service area, the first time When the second communication terminal returns to the service area before the elapse of time (S2015: No), the control-side transmission control unit 222 controls the voice packet indicating the voice data recorded by the control-side data recording unit 230. The data is transmitted from the side data transmission unit 210 to the second communication terminal (S2025). When the first communication terminal releases the right to speak (S2035: Yes), the communication control device 20 ends the process. When the first communication terminal still has the right to speak (S2035: No), the control-side data receiving unit 215 continues receiving voice packets.

  Then, when the control-side communication availability determination unit 250 determines that the voice packet cannot be transmitted to the second communication terminal, the second predetermined time measured by the control-side second timer 264 elapses. When the two communication terminals do not return to the service area (S2030: Yes), the control-side communication control unit 226 ends the half-duplex communication between the first communication terminal and the second communication terminal (S2040). On the other hand, when the control-side communication availability determination unit 250 determines that the voice packet cannot be transmitted to the second communication terminal, the second predetermined time measured by the control-side second timer 264 elapses. 2 When the communication terminal returns to the service area (S2040: No), the control-side data receiving unit 215 continues to receive the voice packet.

  FIG. 6 shows an example of the hardware configuration of the communication terminal 10 and the communication control apparatus 20 according to the present embodiment. The communication terminal 10 and the communication control device 20 according to the present embodiment include a CPU peripheral unit having a CPU 1505, a RAM 1520, a graphic controller 1575, and a display device 1580 connected to each other by a host controller 1582, and an input / output controller 1584. An input / output unit having a communication interface 1530, a hard disk drive 1540, and a CD-ROM drive 1560 connected to the host controller 1582; a ROM 1510, a flexible disk drive 1550, and an input / output chip 1570 connected to the input / output controller 1584; A legacy input / output unit.

  The host controller 1582 connects the RAM 1520 to the CPU 1505 and the graphic controller 1575 that access the RAM 1520 at a high transfer rate. The CPU 1505 operates based on programs stored in the ROM 1510 and the RAM 1520 to control each unit. The graphic controller 1575 acquires image data generated by the CPU 1505 or the like on a frame buffer provided in the RAM 1520 and displays the image data on the display device 1580. Alternatively, the graphic controller 1575 may include a frame buffer that stores image data generated by the CPU 1505 or the like.

  The input / output controller 1584 connects the host controller 1582 to the communication interface 1530, the hard disk drive 1540, and the CD-ROM drive 1560, which are relatively high-speed input / output devices. The communication interface 1530 communicates with other devices via a network. The hard disk drive 1540 stores programs and data used by the CPU 1505 in the communication terminal 10 and the communication control device 20. The CD-ROM drive 1560 reads a program or data from the CD-ROM 1595 and provides it to the hard disk drive 1540 via the RAM 1520.

  The input / output controller 1584 is connected to the ROM 1510, the flexible disk drive 1550, and the relatively low-speed input / output device of the input / output chip 1570. The ROM 1510 stores a boot program executed when the communication terminal 10 and the communication control device 20 are started, a program depending on the hardware of the communication terminal 10 and the communication control device 20, and the like. The flexible disk drive 1550 reads a program or data from the flexible disk 1590 and provides it to the hard disk drive 1540 via the RAM 1520. The input / output chip 1570 connects various input / output devices via a flexible disk drive 1550 such as a parallel port, a serial port, a keyboard port, and a mouse port.

  A communication program and a communication control program provided to the hard disk drive 1540 through the RAM 1520 are stored in a recording medium such as the flexible disk 1590, the CD-ROM 1595, or an IC card and provided by the user. The communication program and the communication control program are read from the recording medium, installed on the communication terminal 10 and the hard disk drive 1540 in the communication control device 20 via the RAM 1520, and executed by the CPU 1505.

  The communication program and the communication control program that are installed and executed in the communication terminal 10 and the communication control device 20 work on the CPU 1505 and the like, so that the communication terminal 10 and the communication control device 20 are described with reference to FIGS. 100, voice output unit 105, terminal side data transmission unit 110, terminal side data reception unit 115, terminal side communication control unit 120, terminal side transmission control unit 122, terminal side reception control unit 124, terminal side communication control unit 126, terminal Side data recording unit 130, voice packet generation unit 135, communication mode setting unit 140, terminal side communication availability determination unit 150, terminal side transmission capability detection unit 155, terminal side timer unit 160, terminal side first timer 162, terminal side first 2 timer 164, terminal-side data erasure unit 170, terminal-side electric field strength detection unit 180, and Control-side data transmission unit 210, control-side data reception unit 215, control-side transmission control unit 222, control-side communication control unit 226, control-side data recording unit 230, control-side communication availability determination unit 250, control-side transmission enable detection unit 255 The control-side timer unit 260, the control-side first timer 262, the control-side second timer 264, the control-side data erasing unit 270, and the control-side electric field strength detecting unit 280 are caused to function.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 is a schematic diagram of a communication system. 2 is a block diagram showing a functional configuration of a communication terminal 10. FIG. 4 is a flowchart showing a flow of processing in the communication terminal 10. 3 is a block diagram illustrating a functional configuration of a communication control device 20. FIG. 4 is a flowchart showing a flow of processing in the communication control device 20. 2 is a block diagram showing a hardware configuration of a communication terminal 10 and a communication control device 20. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Communication terminal 20 Communication control apparatus 30 Communication relay apparatus 40 Network 100 Voice input part 105 Voice output part 110 Terminal side data transmission part 115 Terminal side data reception part 120 Terminal side communication control unit 122 Terminal side transmission control part 124 Terminal side reception control Unit 126 terminal side communication control unit 130 terminal side data recording unit 135 voice packet generation unit 140 communication mode setting unit 150 terminal side communication availability determination unit 155 terminal side transmission enable detection unit 160 terminal side timer unit 162 terminal side first timer 164 terminal Side second timer 170 terminal side data erasure unit 180 terminal side electric field strength detection unit 210 control side data transmission unit 215 control side data reception unit 222 control side transmission control unit 226 control side communication control unit 230 control side data recording unit 250 control side Communication availability determination unit 255 Control Transmittable detecting unit 260 control side timer unit 262 controls side first timer 264 controls side second timer 270 control side data deleting unit 280 controls the side field strength detection section 1505 CPU
1510 ROM
1520 RAM
1530 Communication interface 1540 Hard disk drive 1550 Flexible disk drive 1560 CD-ROM drive 1570 Input / output chip 1575 Graphic controller 1580 Display device 1582 Host controller 1584 Input / output controller 1590 Flexible disk 1595 CD-ROM

Claims (5)

A communication terminal for performing packet communication of voice data,
A voice input unit for inputting voice;
A voice packet generation unit that generates a voice packet indicating the voice input by the voice input unit;
A data transmission unit that transmits the voice packet generated by the voice packet generation unit to a communication terminal of a communication partner;
Whether the voice packet can be transmitted from the data transmission unit to the communication terminal of the communication partner by monitoring the electric field strength from an external communication relay device that relays communication with the communication terminal of the communication partner A communication availability determination unit for determining
A data recording unit that records audio data indicated by the audio packet to be transmitted by the data transmission unit when the communication availability determination unit determines that the audio packet cannot be transmitted from the data transmission unit;
When the data recording unit records the voice data, the transmission capability detection that detects that the voice packet can be transmitted from the data transmission unit by monitoring the electric field strength from the communication relay device. And
The transmission enable detection unit can transmit the voice packet from the data transmission unit until the first predetermined time elapses after the communication availability determination unit determines that the voice packet cannot be transmitted. A transmission control unit for transmitting the voice packet indicating the voice data recorded by the data recording unit from the data transmission unit to the communication terminal of the communication partner when it is detected that the data recording unit is in a state;
It is detected that the transmittable detection unit is ready to transmit the voice packet after the first time elapses after the communication availability determination unit determines that the voice packet cannot be transmitted. A communication terminal comprising: a data erasure unit for erasing the audio data recorded by the data recording unit if not . A data receiving unit for receiving a voice packet transmitted by the communication terminal of the communication partner;
An audio output unit that outputs audio indicated by an audio packet received by the data receiving unit;
The data reception unit receives a voice packet and the voice output unit outputs a voice. The voice input unit inputs a voice and the data transmission unit transmits a voice packet. A communication mode setting unit for setting the communication mode of the communication terminal;
The communication terminal according to claim 1, wherein packet communication of voice data is performed by a half-duplex communication method. From the time the communication possibility determining section determines not to send the voice packet, until the second time determined long in advance than the first time elapses, the transmittable detection unit said voice packet The communication terminal according to claim 2, further comprising a communication control unit that terminates half-duplex communication with the communication terminal of the communication partner when it is not detected that transmission is possible. A communication method for performing packet communication of audio data,
A voice input stage for inputting voice;
A voice packet generation step of generating a voice packet indicating the voice input in the voice input step;
Data transmission for transmitting the voice packet generated in the voice packet generation stage to the communication terminal of the communication partner by monitoring electric field strength from an external communication relay device that relays communication with the communication terminal of the communication partner A communication availability determination stage for determining whether transmission is possible from
A data recording step for recording audio data indicated by the audio packet to be transmitted by the data transmission unit when it is determined in the communication availability determination step that the audio packet cannot be transmitted from the data transmission unit;
When the voice data is recorded in the data recording stage, it is possible to detect that the voice packet can be transmitted from the data transmission unit by monitoring the electric field strength from the communication relay device. The detection stage;
From the time when it is determined that the voice packet cannot be transmitted in the communication availability determination step, the voice packet can be transmitted from the data transmission unit in the transmission capability detection step until a predetermined first time elapses. A transmission control step for transmitting the voice packet indicating the voice data recorded in the data recording step from the data transmission unit to the communication terminal of the communication partner when it is detected that the state has been reached;
From the time when it is determined that the voice packet cannot be transmitted in the communication feasibility determination step, until the first time elapses, it is not detected that the voice packet can be transmitted in the transmission capability detection step. A data erasing step of erasing the audio data recorded in the data recording step . A communication program for a communication terminal that performs packet communication of voice data, the communication terminal,
Voice input part for inputting voice,
A voice packet generation unit that generates a voice packet indicating the voice input by the voice input unit;
A data transmission unit for transmitting the voice packet generated by the voice packet generation unit to a communication terminal of a communication partner;
Whether the voice packet can be transmitted from the data transmission unit to the communication terminal of the communication partner by monitoring the electric field strength from an external communication relay device that relays communication with the communication terminal of the communication partner A communication availability determination unit for determining
A data recording unit that records audio data indicated by the audio packet to be transmitted by the data transmission unit when the communication availability determination unit determines that the audio packet cannot be transmitted from the data transmission unit;
When the data recording unit records the voice data, the transmission capability detection that detects that the voice packet can be transmitted from the data transmission unit by monitoring the electric field strength from the communication relay device. Part,
The transmission enable detection unit can transmit the voice packet from the data transmission unit until the first predetermined time elapses after the communication availability determination unit determines that the voice packet cannot be transmitted. A transmission control unit for transmitting the voice packet indicating the voice data recorded by the data recording unit from the data transmission unit to the communication terminal of the communication partner when it is detected that the data recording unit is in a state;
The transmission availability detection unit does not detect that the voice packet can be transmitted before the first time elapses after the communication availability determination unit determines that the voice packet cannot be transmitted. A communication program that causes the data recording unit to function as a data erasing unit that erases the audio data recorded by the data recording unit .

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